The Haunting of Julia (Full Circle) (1977) [Kate Lofting]: Reportedly accidentally choked to death while eating an apple. (Thanks to Michael)

Young Sherlock Holmes (Pyramid of Fear) (1985) [Elizabeth Hardy]: Shot in the stomach by Anthony Higgins when she runs in front of Nicholas Rowe and takes the bullet for him; she dies in Nicholas' arms shortly after Anthony is defeated. (Thanks to Chris and PhantasyMan)